Source file src/runtime/os_netbsd_arm.go

     1	// Copyright 2013 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	package runtime
     6	
     7	import "unsafe"
     8	
     9	func lwp_mcontext_init(mc *mcontextt, stk unsafe.Pointer, mp *m, gp *g, fn uintptr) {
    10		// Machine dependent mcontext initialisation for LWP.
    11		mc.__gregs[_REG_R15] = uint32(funcPC(lwp_tramp))
    12		mc.__gregs[_REG_R13] = uint32(uintptr(stk))
    13		mc.__gregs[_REG_R0] = uint32(uintptr(unsafe.Pointer(mp)))
    14		mc.__gregs[_REG_R1] = uint32(uintptr(unsafe.Pointer(gp)))
    15		mc.__gregs[_REG_R2] = uint32(fn)
    16	}
    17	
    18	func checkgoarm() {
    19		// TODO(minux): FP checks like in os_linux_arm.go.
    20	
    21		// osinit not called yet, so ncpu not set: must use getncpu directly.
    22		if getncpu() > 1 && goarm < 7 {
    23			print("runtime: this system has multiple CPUs and must use\n")
    24			print("atomic synchronization instructions. Recompile using GOARM=7.\n")
    25			exit(1)
    26		}
    27	}
    28	
    29	//go:nosplit
    30	func cputicks() int64 {
    31		// Currently cputicks() is used in blocking profiler and to seed runtime·fastrand().
    32		// runtime·nanotime() is a poor approximation of CPU ticks that is enough for the profiler.
    33		// TODO: need more entropy to better seed fastrand.
    34		return nanotime()
    35	}
    36	

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